| Abbreviation | Definition |
|---|---|
| COMSA | Colorado Masters Swimming Association |
| COSAC | City Of Sydney Aquatic Centre |
| CPAC | College Park Aquatic Club |
| CRST | Columbia River Swim Team |
| CSL | Colonial Swimming League |
| CSOA | Collegiate Swimming Officials Association |
| CSZ | Cairo Swimming Zone |
| CWSC | Chelsea and Westminster Swimming Club |
| CYSL | Carolina YMCA Swim League |
| DASA | Dallas Amateur Swimming Association |
| DDSC | Dartford District Swimming Club |
| DDST | Dothan Dolphin Swim Team |
| DDST | Douglas Dolfins Swim Team |
| DHST | Dana Hills Swim Team |
| DMSC | Dubai Masters Swimming Club |
| DOCS | Developmental Organized Competitive Swimming |
| DRSA | Devonport Royal Swimming Association |
| EFSL | European Forces Swim League |
| EKI | Edmonton Keyano International swim meet |
| EKSC | Edmonton Keyano Swim Club |